Starts a thread that searches the external file directory for the given field name, including subdirectories, and looks for files named after the current entry's bibtex key. Returns a reference to the thread for callers that may want to wait for the thread to finish (using join()).
@param fieldName The field to set.
@param editor An EntryEditor instance where to set the value found.
@return A reference to the Thread that performs the operation.
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